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Understanding Diffusion and Osmosis in Biology

Explore the movement of molecules across membranes without energy in biology. Learn how molecules move from high to low concentrations and the effects on cell shape. Discover isotonic, hypertonic, and hypotonic solutions and their impact on cells.

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Understanding Diffusion and Osmosis in Biology

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  1. Diffusion/ Osmosis Mrs. Hansell Biology I

  2. Movement of molecules across a membrane WITHOUT energy Movement of molecules High to Low -Large polar molecules can not pass Movement of water High to Low -Small polar can pass High to Low http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_diffusion_works.html

  3. H2O movement Molecule Isotonic Hypertonic Hypotonic Isotonic- Hypotonic- Hypertonic- Equal H2O & molecules Cell keeps normal shape More molecules, less H2O Cell shrivels More H2O, less molecules—Cell swells http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_osmosis_works.html

  4. Diffusion of molecules across a membrane through a transport protein. http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html

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